Search found 59 matches

by aurgathor
Tue Jun 25, 2019 8:38 pm
Forum: Off-Topic
Topic: Theoretical radio course
Replies: 1
Views: 375

Re: Theoretical radio course

You could start by reading: https://en.wikipedia.org/wiki/Modulation

There are quite a few books and webpages for self study material.
by aurgathor
Tue Jun 11, 2019 2:21 pm
Forum: User Projects
Topic: How to buy an SDR chip
Replies: 9
Views: 1277

Re: How to buy an SDR chip

Just use the correct search terms such as "RTL2832U, chip, for sale" ;) https://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=75636&utm_source=GoogleShopping&utm_medium=cpc&utm_content=Realtek&utm_campaign=RTL2832U-GR&gclid=EAIaIQobChMI3py1us_h4gIVkK_sCh1BtA1-EAQYAiABEgLg5fD_BwE https://w...
by aurgathor
Mon Jun 03, 2019 2:19 am
Forum: Other SDR Devices
Topic: Suggestions for SDR kit
Replies: 3
Views: 749

Re: Suggestions for SDR kit

There is the Red Pitaya, but that one isn't exactly cheap either.

However, as per: https://wiki.analog.com/university/tools/pluto you should be able to program the Zynq
"normally write custom software or HDL (for the FPGA) that runs directly on the PlutoSDR"
by aurgathor
Tue May 07, 2019 3:31 pm
Forum: Antennas
Topic: proper antenna for energy meter monitoring (900Mhz)
Replies: 5
Views: 1161

Re: proper antenna for energy meter monitoring (900Mhz)

You should be able to figure out if the transmitter is on or not. You can just use a piece of wire as an antenna and have them near the meter, and look at the spectrum. If there is a very strong signal around 900 MHz, that is probably your meter. Then move away from the meter to see if the signal le...
by aurgathor
Fri May 03, 2019 3:22 pm
Forum: Antennas
Topic: proper antenna for energy meter monitoring (900Mhz)
Replies: 5
Views: 1161

Re: proper antenna for energy meter monitoring (900Mhz)

Why a dipole antenna? Methinks a quarter wave monopole should work just fine, too.
by aurgathor
Thu May 02, 2019 4:06 pm
Forum: Other SDR Devices
Topic: SDR Upgrade
Replies: 5
Views: 1527

Re: SDR Upgrade

Yeah, I'd second the suggestion for a bandpass filter, either a switchable filter, or standalone filters for the desired band(s) based on the issues listed.
by aurgathor
Tue Apr 23, 2019 12:37 am
Forum: Other SDR Devices
Topic: Ham It Up + Cubic SDR problem
Replies: 1
Views: 568

Re: Ham It Up + Cubic SDR problem

Unless you do some input filtering, you'll get both up and down converted products.

Use a low pass filter (say, 100 Mhz) between the antenna and the ham-it-up.
by aurgathor
Thu Apr 18, 2019 5:38 pm
Forum: RTL-SDR Discussion
Topic: rtl-sdr .usb problem
Replies: 1
Views: 406

Re: rtl-sdr .usb problem

Re-run zadig
by aurgathor
Wed Apr 17, 2019 2:57 pm
Forum: Off-Topic
Topic: USB cable
Replies: 3
Views: 1335

Re: USB cable

Any size of extender cable should work as long as it can handle the roughly 300 mA without a significant voltage drop and it's not too bad otherwise. I bought some 6" pigtail extender cables for the exact same reason from monoprice 5+ years ago and they work fine with RTL-SDR dongles. (monoprice no ...
by aurgathor
Sun Apr 14, 2019 1:19 am
Forum: Other SDR Devices
Topic: Why Tx/Rx devices are so expansives ?
Replies: 9
Views: 19124

Re: Why Tx/Rx devices are so expensive?

RichardsonRFPD will conduct several one day seminars in the US for mere $150, and that price will include a Pluto SDR learning module. If someone can attend one without paying for hotel and airfare, I think the complete package is a steal at that price. The Pluto itself is over $140 from Mouser. Key...